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In all
likelihood the mangnetron is failed or failing, or perhaps even the Power Supply is
faulty. You need to have it serviced by a reputable service centre/man.Ensure
you get a firm "Quote" before proceeding, and remember these days the
cost of repair can equal or exceed the price of a new one

If the microwave comes with a roller ring to rotate the glass turntable then I would recommend that it needs to be used when the microwave is operating, as the turntable rotates the food so it can be heated evenly.

I would recommend checking with your local Panasonic repairer he may have access to a new roller or even a second hand one to tide you over.